Canon IR3300, IR2800, IR2200 Outline of Electrical Circuitry, Reader Controller PCB, Cpu, Ram, Rom

CHAPTER 1 BASIC OPERATION

1 Outline of Electrical Circuitry

1.1 Outline

The major mechanisms of the reader unit are controlled by the CPU on the reader control- ler PCB.

The functions of the major ICs are as indicated in the following table.

1.2 Reader Controller PCB

Name	Description
CPU	• Controls the sequence of scanner	• Controls the scanning lamp.
	operations.	• Controls shading correction.
	• Controls the original size detection	• Controls service mode.
	mechanism.	• Controls the communications with
	• Controls the CCD.	the main controller.
	• Controls the communications with
	the ADF.
RAM	• Stores service mode data.

•Stores user mode data.

•Stores control data.

EEP-ROM • Backs up RAM data.

ROM • Stores control programs.

Controller unit

Printer unit

T01-102-01 List of Control Items
CPU	Inverter
(IC400)
	PCB	LAMP1
ROM
(IC401)
	M400	Scanner
RAM		motor
(IC402)
EEPROM	CCD
(IC403)
	PCB
IPC	ADF
(IC404)
Reader controller PCB
F01-102-01 Major PCBs

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 1-1 R